<html> 
<title>js随机抽奖程序</title> 
<head><meta http-equiv=Content-Type content="text/html; charset=utf-8"> 
</head> 
<body> 
<script type="text/javascript"> 
var alldata = "a,b,c,d,e,f,g,h,i,j,k" 
var alldataarr = alldata.split(","); 
var num = alldataarr.length-1 ; 
var timer 
function change() 
{ 
document.getElementById("oknum").innerHTML = alldataarr[GetRnd(0,num)]; 
} 
function start(){ 
clearInterval(timer); 
timer = setInterval('change()',100); 
} 
function ok(){ 
clearInterval(timer); 
document.getElementById("showresult").value=document.getElementById("oknum").innerText; 
} 
function GetRnd(min,max){ 
return parseInt(Math.random()*(max-min+1)); 
} 
</script> 
<center> 
<div id="oknum" name="oknum" >请单击开始</div> 
<button onclick="start()" accesskey="s">开始</button> 
<button onclick="ok()" accesskey="o">停止</button> 
您的选择是： 
<input type="text" id="showresult" value="">
</center>

</body> 
</html>